Portion of a firearm barrel



FIG. 1 is an isometric view of the portion of a firearm barrel;

FIG. 2 is a side plan view thereof, all side views being substantially the same; and,

FIG. 3 is an end plan view thereof, both end views being substantially the same.

The opposing ends of the claimed design in FIGS. 1-3 indicate that no specific distance end to end is claimed.

Matter shown in broken line forms no part of the claimed design. 

CLAIM The ornamental design for a portion of a firearm barrel, as shown and described. 